/**
 ******************************************************************************
 *
 * @file       styleanimator.cpp
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 *             Parts by Nokia Corporation (qt-info@nokia.com) Copyright (C) 2009.
 * @addtogroup GCSPlugins GCS Plugins
 * @{
 * @addtogroup CorePlugin Core Plugin
 * @{
 * @brief The Core GCS plugin
 *****************************************************************************/
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "styleanimator.h"

#include <QStyleOption>

Animation *StyleAnimator::widgetAnimation(const QWidget *widget) const
{
    if (!widget) {
        return 0;
    }
    foreach(Animation * a, animations) {
        if (a->widget() == widget) {
            return a;
        }
    }
    return 0;
}

void Animation::paint(QPainter *painter, const QStyleOption *option)
{
    Q_UNUSED(option)
    Q_UNUSED(painter)
}

void Animation::drawBlendedImage(QPainter *painter, QRect rect, float alpha)
{
    if (m_secondaryImage.isNull() || m_primaryImage.isNull()) {
        return;
    }

    if (m_tempImage.isNull()) {
        m_tempImage = m_secondaryImage;
    }

    const int a   = qRound(alpha * 256);
    const int ia  = 256 - a;
    const int sw  = m_primaryImage.width();
    const int sh  = m_primaryImage.height();
    const int bpl = m_primaryImage.bytesPerLine();
    switch (m_primaryImage.depth()) {
    case 32:
    {
        uchar *mixed_data = m_tempImage.bits();
        const uchar *back_data  = m_primaryImage.bits();
        const uchar *front_data = m_secondaryImage.bits();
        for (int sy = 0; sy < sh; sy++) {
            quint32 *mixed = (quint32 *)mixed_data;
            const quint32 *back  = (const quint32 *)back_data;
            const quint32 *front = (const quint32 *)front_data;
            for (int sx = 0; sx < sw; sx++) {
                quint32 bp = back[sx];
                quint32 fp = front[sx];
                mixed[sx] = qRgba((qRed(bp) * ia + qRed(fp) * a) >> 8,
                                  (qGreen(bp) * ia + qGreen(fp) * a) >> 8,
                                  (qBlue(bp) * ia + qBlue(fp) * a) >> 8,
                                  (qAlpha(bp) * ia + qAlpha(fp) * a) >> 8);
            }
            mixed_data += bpl;
            back_data  += bpl;
            front_data += bpl;
        }
    }
    default:
        break;
    }
    painter->drawImage(rect, m_tempImage);
}

void Transition::paint(QPainter *painter, const QStyleOption *option)
{
    float alpha = 1.0;

    if (m_duration > 0) {
        QTime current = QTime::currentTime();

        if (m_startTime > current) {
            m_startTime = current;
        }

        int timeDiff = m_startTime.msecsTo(current);
        alpha = timeDiff / (float)m_duration;
        if (timeDiff > m_duration) {
            m_running = false;
            alpha     = 1.0;
        }
    } else {
        m_running = false;
    }
    drawBlendedImage(painter, option->rect, alpha);
}

void StyleAnimator::timerEvent(QTimerEvent *)
{
    for (int i = animations.size() - 1; i >= 0; --i) {
        if (animations[i]->widget()) {
            animations[i]->widget()->update();
        }

        if (!animations[i]->widget() ||
            !animations[i]->widget()->isEnabled() ||
            !animations[i]->widget()->isVisible() ||
            animations[i]->widget()->window()->isMinimized() ||
            !animations[i]->running()) {
            Animation *a = animations.takeAt(i);
            delete a;
        }
    }
    if (animations.size() == 0 && animationTimer.isActive()) {
        animationTimer.stop();
    }
}

void StyleAnimator::stopAnimation(const QWidget *w)
{
    for (int i = animations.size() - 1; i >= 0; --i) {
        if (animations[i]->widget() == w) {
            Animation *a = animations.takeAt(i);
            delete a;
            break;
        }
    }
}

void StyleAnimator::startAnimation(Animation *t)
{
    stopAnimation(t->widget());
    animations.append(t);
    if (animations.size() > 0 && !animationTimer.isActive()) {
        animationTimer.start(35, this);
    }
}
